Its obviously a loose wire or dirty connection somewhere. First I would hook up a new ground wire between the cluster and any good body ground. Second, I would look very carefully at all the male and female connection points in the connector for the cluster. Clean all the contacts with contact cleaner and a flat toothpick. Did the previous owner put in an aftermarket radio? If so, maybe he messed up some wires while in there. Cayman Islands-wow
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